Take three or four large flat mushrooms. Wash and dry with kitchen towel and place on a baking tray. Fill with whatever you have. These one are filled with two rashers of bacon, and some brie topped with leftover mash potatoes and a little grated cheese and freshly milled black pepper (between the three mushrooms). Dribble with a little Olive oil. Cook at 180 degrees until cooked and the cheese has melted.